Enable ExternalProtocolDialog for Chromeos.

      * It simply says it's not supported as ChromeOS wont launch external program.
Fixed resource files to use chromeos. Apparently I misunderstood how this works when I added 'toolkit_views' to grd files. It was never defined, and wasn't necessary.

BUG=23853
TEST=type in &quotapple.cm&quot in the omnibox and it should popup the external protocol dialog.

Review URL: http://codereview.chromium.org/342040

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@30593 0039d316-1c4b-4281-b951-d872f2087c98